fi_rxm(7)

NAME

The RxM (RDM over MSG) Utility Provider

OVERVIEW

The RxM provider (ofi_rxm) is an utility provider that supports RDM endpoint emulated over MSG endpoint of a core provider.

REQUIREMENTS

RxM provider requires the core provider to support the following features:

•   MSG endpoints (FI_EP_MSG)

•   Shared receive contexts (FI_SHARED_CONTEXT)

•   RMA read/write (FI_RMA)

•   FI_OPT_CM_DATA_SIZE of atleast 24 bytes

SUPPORTED FEATURES

The RxM provider currently supports FI_MSG, FI_TAGGED and FI_RMA capabilities.

Endpoint types : The provider supports only FI_EP_RDM.

Endpoint capabilities : The following data transfer interface is supported: FI_MSG, FI_TAGGED, FI_RMA.

Progress : The RxM provider supports only FI_PROGRESS_MANUAL for now.

Addressing Formats : FI_SOCKADDR, FI_SOCKADDR_IN

Memory Region : FI_MR_VIRT_ADDR, FI_MR_ALLOCATED, FI_MR_PROV_KEY MR mode bits would be required from the app in case the core provider requires it.

LIMITATIONS

When using RxM provider, some limitations from the underlying MSG provider could also show up. Please refer to the corresponding MSG provider man pages to find about those limitations.

  Unsupported features

RxM provider does not support the following features:

•   op_flags: FI_CLAIM, FI_PEEK, FI_FENCE.

•   FI_ATOMIC

•   Scalable endpoints

•   Shared contexts

•   FABRIC_DIRECT

•   Multi recv

•   Counters

•   FI_MR_SCALABLE

•   Authorization keys

•   Application error data buffers

•   Multicast

•   FI_ADDR_STR, FI_SYNC_ERR

•   Reporting unknown source addr data as part of completions

•   Triggered operations

•   fi_cq_sread, fi_cq_sreadfrom and fi_cq_signal calls.

  Usage limitations

RxM provider should work fine for client - server programs like fabtests. Support for MPI, SHMEM and other applications is work in progress.

RUNTIME PARAMETERS

No runtime parameters are currently defined.

SEE ALSO

fabric(7), fi_provider(7), fi_getinfo(3)

AUTHORS
OpenFabrics.